bob said he was going to join our club but he didn't.he()his

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bob said he was going to join our club but he didn't.he()his mind.A.can't have changed B.wouldn't have changed c.must have changed d.shouldn't have changed.我觉得C.D都能选啊,他肯定改变了他的想法或他不应该改变他的想法的,但他却改变了.带有斥责的感情.求讲解

C 这道题考的是针对前面提到的情况的推测而不是自己谈论自己心里的感受.鲍勃说他打算加入我们俱乐部,但他却没有.他一定是改变主意了.
再问：但是也可以是自己的想法吧？为什么不行啊，不懂。因为主语都是他，所以不提及我们的感受吗？还有()you fetch me some hot water?应该填can,may？求讲解，就这么一句话吗，怎么看出请求语气的强弱呢？
再答：因为这句话很可能是讲给别人听的，所以一般是向别人介绍情况而不是抱怨，你说呢？后面的问题我觉得can好些，may适合于更委婉表达请求的场合，这里你是希望别人帮你取水，所以语气应当强烈些。May有点类似我们平时说的那种“弱弱地问一句，你可以。。。”
再问： may就是不肯定对方是否答应，然后弱弱的问，然can是强烈的请求？可这个怎么分啊，有可能别人会不会帮你去都不知道，May I use your eraser? 就像这一句，他们同样是请求啊，请求本来就语气要弱弱的吧，那can和may用法就搞不懂了
再答：简单说来，can一般要求别人，may说的是自己可不可以

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